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A147597
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a(n) is the number whose binary representation is A138146(n).
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3
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1, 7, 31, 119, 455, 1799, 7175, 28679, 114695, 458759, 1835015, 7340039, 29360135, 117440519, 469762055, 1879048199, 7516192775, 30064771079, 120259084295, 481036337159, 1924145348615, 7696581394439, 30786325577735
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Bisection of A147596.
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FORMULA
| a(n)=5*a(n-1)-4*a(n-2), n>5. G.f.: x*(2*x+1)*(2*x-1)*(4*x^2+2*x+1)/((4*x-1)*(1-x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 05 2010]
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CROSSREFS
| Cf. A138146, A145641, A147537, A147538, A147539, A147540, A147590, A147595, A147596.
Sequence in context: A091344 A032197 A114289 * A048775 A125193 A002184
Adjacent sequences: A147594 A147595 A147596 * A147598 A147599 A147600
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KEYWORD
| base,easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Nov 08 2008
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 05 2010
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